French prosecutor Patrick Quincy attends a news conference to speak about the ski accident of former Formula One champion Michael Schumacher, in Albertville. The French mountain slope on which former Formula One champion Michael Schumacher had a skiing accident had been prepared according to national standards, the local prosecutor told a news conference on Jan 8, 2014. -- PHOTO: REUTERS

ALBERTVILLE, FRANCE (REUTERS) - The French mountain slope on which former Formula One champion Michael Schumacher had a skiing accident had been prepared according to national standards, the local prosecutor told a news conference on Wednesday.

"There are French standards setting rules on safety, signalling, demarcation... The checks we have made show these standards had been respected," said prosecutor Patrick Quincy.

He was presenting the results of a police investigation into a Dec 29 fall that left Schumacher in a critical condition with brain injuries. The German has been in an induced coma since then and has undergone two operations in Grenoble.

Quincy added that he could not assess Schumacher's speed at the time of the accident after watching footage from the German's helmet camera.